Crossword Genius

Deceive a top officer at a certain point (3)

Ross

I believe the answer is:

con

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'deceive' is the definition.
(I've seen this before)

'a top officer at a certain point' is the wordplay.
'a top officer' becomes 'CO' (commanding officer).
'at' means one lot of letters go next to another.
'a certain point' becomes 'n' (North. I am not sure about the 'certain' bit.).
'co'+'n'='CON'

Can you help me to learn more?

(Other definitions for con that I've seen before include "Deceive; disadvantage" , "Swindle in draconian way" , "Opposed" , "Trick, deceive" , "Diddle" .)

I've seen this clue in the Evening Standard.
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